Possible Spark Knock? How to Fix

[94jettameowpsst]

Don't sea foam it.

Knock is usually inaudible unless you're reallllly listening for it or if you have really good hearing.

Check valve seats, lifters, and plugs/wires before u do anything else.

Is it missing at idle? If u can actually hear some pinging its most likely carbon, otherwise if it does it under full or partial load it's a rod or wrist pin.

I ran 87 in my Dsm a few times to see if my knock sensor was still even working (plus was going on vacation((8psi = whatever))) and it knocked like a boss and if I wouldn't have logged it the ONLY way I knew it was actually knocking was because it also pulls timing; in other words it lost a lot of power.

Just food for thought

[94jettameowpsst]

Also if u have no way to log information check the voltage of your knock sensor. Rev it and whatnot and the voltage shouldn't change unless it is indeed knocking.

[Jessica]

I see the guys over at toyotanation.com weren't very helpful.

Since it does it on hotter days more often, and it does it under load more often, then i am going to say its safe to say its spark knock.

is your car running hotter than normal? I didn't see if you checked the MAF or not. Does your car have a distributor? if so it may be a vacuum advance issue or may just need timed.

edit

if it has a vacuum advance on it, its suppose to adjust the timing a bit under acceleration. if it is bad then it wont and you get spark knock.